Person:
ÖZLEN, RÜMEYSA HATİCE

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RÜMEYSA HATİCE
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ÖZLEN
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Now showing 1 - 4 of 4
  • PublicationOpen Access
    Effect of polymerization time and home bleaching agent on the microhardness and surface roughness of bulk-fill composites: A scanning electron microscopy study
    (2019-01-01T00:00:00Z) ÖZDUMAN, ZÜMRÜT CEREN; Kazak, Magrur; FİLDİŞİ, MEHMET ALİ; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, Evrim; DÖNMEZ, NAZMİYE; ÖZDUMAN, ZÜMRÜT CEREN; FİLDİŞİ, MEHMET ALİ; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRIM; DÖNMEZ, NAZMİYE
    Objective: The aim of this study is to evaluate the microhardness and surface roughness of two different bulk-fill composites polymerized with light-curing unit (LCU) with different polymerization times before and after the application of a home bleaching agent. Materials-methods: For both microhardness and surface roughness tests, 6 groups were prepared with bulk-fill materials (SonicFill, Filtek Bulk Fill) according to different polymerization times (10, 20, and 30 s). 102 specimens were prepared using Teflon molds (4 mm depth and 5 mm diameter) and polymerized with LCU. 30 specimens (n = 5) were assessed for microhardness. Before home bleaching agent application, the bottom/top (B/T) microhardness ratio was evaluated. After bleaching agent application, the microhardness measurements were performed on top surfaces. Roughness measurements were performed in 72 specimens (n = 12) before and after bleaching application. Additionally, for SEM analyses, two specimens from all tested groups were prepared before and after bleaching agent application. The data B/T microhardness ratio before bleaching was analyzed by two-way ANOVA and Tukey's HSD test. The data from the top surface of specimens' microhardness before and after bleaching were analyzed using Wilcoxon signed-rank test, Kruskal-Wallis, Mann-Whitney U tests. The data from surface roughness tests were statistically analyzed by multivariate analysis of variance and Bonferroni test (p < 0.05). Results: The B/T microhardness ratio results revealed no significant differences between groups (p > 0.05). Comparing the microhardness values of the composites' top surfaces before and after bleaching, a significant decrease was observed exclusively in FB30s (p < 0.05). No significant differences in surface roughness values were observed when the groups were compared based on bulk-fill materials (p > 0.05) while the polymerization time affected the surface roughness of the SF20s and SF30s groups (p < 0.05). After bleaching, surface roughness values were significantly increased in the SF20s and SF30s groups (p < 0.05). Conclusion: The clinicians should adhere to the polymerization time recommended by the manufacturer to ensure the durability of the composite material in the oral environment.
  • PublicationMetadata only
    Effect of titanium dioxide nanotubes on the mechanical and antibacterial properties of the low-viscosity bulk-fill composite
    (2021-10-01T00:00:00Z) ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, Evrim; KÜÇÜKYILDIRIM, Bedri Onur; AKDOĞAN EKER, Ayşegül; Topcuoglu, Nursen; Kulekci, Guven; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRIM
    The purpose of this investigation is to determine the impact of titanium dioxide nanotubes (TiO2-n) on the mechanical and antibacterial properties of bulk-fill composite resin. TiO2-n were synthesized in laboratory conditions using the hydrothermal method. Varying amounts of TiO2-n were included in the bulk-fill composite resin. Microhardness, surface roughness, and the three-point bending test were used to determine the mechanical properties of the composite. After the flexural strength test, the fractured surfaces of the composite resin were examined with a high-resolution scanning electron microscope. The antibacterial activity of Streptococcus mutans (S.mutans) and Lactobacillus Casei (L.casei) was assessed using a direct contact test. The statistical examination was completed using IBM SPSS Statistics 22. Group differences were compared using the Kruskal Wallis and Dunn tests (p 0.05). Adding 0.5% and 1% TiO2-n increased the microhardness of the bulk-fill composite (p 0.05). Though adding TiO2-n did not have an antibacterial impact on S.mutans (p > 0.05), adding 0.5% TiO2-n produced an antibacterial impact on L.casei in daylight (p < 0.05). The addition of 0.5% and 1% TiO2-n increased the microhardness of the top surface of the bulk-fill composite without negatively affecting surface roughness or the composite-s three-point bending properties Adding 0.5% TiO2-n to the composite resin produced an antibacterial impact on L.casei in daylight.
  • PublicationMetadata only
    The effect of home bleaching agent and polymerization time on surface roughness.
    (2019-08-29T00:00:00Z) FİLDİŞİ, MEHMET ALİ; ÖZLEN, RÜMEYSA HATİCE; Özduman, Zümrüt Ceren; DALKILIÇ, EVRİM; KAZAK, MAĞRUR; DÖNMEZ, NAZMİYE; FİLDİŞİ, MEHMET ALİ; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRIM; DÖNMEZ, NAZMİYE
  • PublicationMetadata only
    Bulk Fill Kompozitlerin Tamirinde Farklı Yüzey Pürüzlendirme İşlemlerinin Makaslama Bağlanma Dayanımı Üzerine Etkisi.
    (2019-09-04T00:00:00Z) Hisarbeyli, Duygu; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRİM; KAZAK, MAĞRUR; DÖNMEZ, NAZMİYE; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRIM; DÖNMEZ, NAZMİYE